Browsing by Author "Chuang, Chun-Yen"

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192-Gbit/s PAM-4 Optical Interconnect using Mode-Division Multiplexing
(2018-01-01)
Hsu, Yung
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Wu, Xinru
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Chuang, Chun-Yen
;
Chow, Chi-Wai
;
Tsang, Hon Ki
192-Gbit/s pulse-amplitude-modulation-4 (PAM-4) signal transmission for on-chip optical interconnects using mode-division-multiplexing (MDM) is experimentally investigated. 3 channels are successfully mode multiplexed and de-multiplexed satisfying the forward-error correction (FEC) requirement.
2.6 Tbit/s On-Chip Optical Interconnect Supporting Mode-Division-Multiplexing and PAM-4 Signal
(2018-06-01)
Hsu, Yung
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Chuang, Chun-Yen
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Wu, Xinru
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Chen, Guan-Hong
;
Hsu, Chin-Wei
In this letter, we combine the use of dense-wavelength-division-multiplexing and mode-division-multiplexing (MDM) with advanced-modulation formats for on-chip optical interconnects. A three-mode MDM multiplexer (MUX) and de-multiplexer (DEMUX) was designed and used. Each wavelength carrier had an aggregate data rate of 192-Gbit/s using 4-level pulse-amplitude-modulation. The mode crosstalk of the MDM MUX/DEMUX was measured to he below -20 dB in the 40-nm wavelength band from 1520 to 1560 nm. Fourteen wavelength channels are multiplexed and successfully transmitted with an aggregate transmission capacity of 2.6 Tbit/s (14 wavelengths x 3 modes x 64 Gbit/s) with all channels satisfying the hard-decision forward-error-correction threshold. Numerical analysis of the mode crosstalk is also performed.
512-Gbit/s PAM-4 Signals Direct-Detection using Silicon Photonics Receiver with Volterra Equalization
(2018-01-01)
Hsu, Yung
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Chuang, Chun-Yen
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Wei, Liang-Yu
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Chow, Chi-Wai
;
Wu, Xinru
A 400-Gbit/s Ethernet (GbE) pulse-amplitude-modulation-4 (PAM-4) over 10-km single-mode-fiber (SMF) transmission direct-detected by an integrated silicon-photonics-receiver satisfying the IEEE P802.3bs requirement; and its feasibility to support 512-Gbit/s were illustrated.
56-Gbps 4-PAM System over Nearly 40 km Transmission by Employing an O-band EML and SOA
(2017-01-01)
Hong-Minh Nguyen
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Chuang, Chun-Yen
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Shie, Bobby
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Wei, Chia-Chien
;
Liu, Jun-Jie
This work demonstrates a 56-Gbps 4-PAM EML-based transmission system. Using an O-band SIA to increase power budget and FFE/DFE to compensate SIA-induced ISM 37.8-km transmission is successfully implemented with BER below the FEC limit (2 x 10(-4)).
67.6% Improvement in Data Rate Employing Partial Transmit Sequence for PAPR Reduction and Volterra Filtering in an OFDM Long-Reach PON
(2017-01-01)
Chuang, Chun-Yen
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Hsu, Chia-Wei
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Wei, Chia-Chien
;
Liu, Jun-Jie
;
Nguyen, Hong-Minh
We applied partial transmit sequence and Volterra filtering to achieve 67.6% improvement in capacity in a high-launch-power 60-km OFDM LR-PON. 61-Gbps capacity and 30-dB loss budget were realized to support 64 ONUs with 0.95 Gbps/ONU.
81.7% Complexity Reduction of Volterra Nonlinear Equalizer by Adopting L1 Regularization Penalty in an OFDM Long-Reach PON
(2017-01-01)
Lu, Shao-Yu
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Wei, Chia-Chien
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Chuang, Chun-Yen
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Chen, Young-Kai
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Chen, Jyehong
We successfully reduce 81.7% complexity of 3rd-order Volterra nonlinear equalizer and the data rate has only 2% reduction by adopting the L1 regularization penalty in a 60-km OFDM long-reach PON.
A High Loss Budget 400-Gbps WDM-OFDM Long-Reach PON over 60 km Transmission by 10G-class EAM and PIN without In-line or Pre-Amplifier
(2017-01-01)
Chuang, Chun-Yen
;
Wei, Chia-Chien
;
Liu, Jun-Jie
;
Wu, Hsin-Yu
;
Hong-Minh Nguyen
A 400-Gbps WDM-OFDM LR-PON over 60-km SMF is demonstrated with a 10G class EAM and PIN. 25-dB loss budget is realized without in-line or pre-amplifier to economically support 128 ONUs with 3.1-Gbps/ONU capacity.
Artificial Neural-Network-Based Pre-Distortion for High Loss-Budget 60-km Long-Reach Passive Optical Network
(2020-01-01)
Nguyen, Hong-Minh
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Huang, Szu-Chi
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Wei, Chia-Chien
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Chuang, Chun-Yen
;
Chen, Jason Jyehong
High launch optical power can compensate for severe fading and power loss in long-reach passive optical networks (LR-PONs); however, it also aggravates nonlinear degradation, which necessitates the use of complex DSP-based nonlinear compensation techniques at optical network users (ONUs). DSP-related techniques also necessitate the use of additional hardware/software components by the receiver, which can greatly increase implementation costs and energy consumption, particularly when dealing with large-scale ONU deployment. This is the first study to propose artificial neural network (ANN)-based pre-distortion to eliminate the need for complex DSP at ONUs in a high-launch-power LR-PON, thereby permitting the use of a simplified architecture at the user end. In the first phase of the study, the proposed ANN-based pre-distortion scheme was implemented in a single-channel IMDD OFDM LR-PON, which achieved a data rate of >55 Gbps over 60-km transmission with a loss budget of 30 dB without the need for optical inline- or pre-amplification. In the second phase of experiments, the same scheme was applied to a 4-channel wavelength division multiplexing (WDM) OFDM LR-PON. Here, the proposed scheme achieved data rates of >200 Gbps using launch power of 18 dBm per lane, resulting in a loss budget of roughly 29 dB over 60-km single mode fiber transmission.
Bandwidth Enhancement Equalization Enabling a 40-Gbps PAM4 Transmission via a 9.5-GHz Photoreceiver
(2016)
Liu, Jun-Jie
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Wei, Chia-Chien
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Tzu, Ta-Ching
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Chuang, Chun-Yen
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Chi, Kai-Lun
We demonstrate a 40-Gbps PAM4 optical system by employing a photoreceiver with bandwidth of only 9.5 GHz. Following 100 m multimode fiber, the BER of l. 8 x 10(-4) and 1.2 x 10(-4) after FFE and DFE equalizations are successfully achieved
Convolutional Neural Network based Nonlinear Classifier for 112-Gbps High Speed Optical Link
(2018-01-01)
Chuang, Chun-Yen
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Liu, Li-Chun
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Wei, Chia-Chien
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Liu, Jun-Jie
;
Henrickson, Lindor
We have designed a novel convolutional neural network based nonlinear classifier that outperforms traditional Volterra nonlinear equalizers. A BER of 3.50 x 10(-6) is obtained for a 112-Gbps PAM4 EML-based optical link over 40-km SMF transmission.
Employing Deep Neural Network for High Speed 4-PAM Optical Interconnect
(2017-01-01)
Chuang, Chun-Yen
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Wei, Chia-Chien
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Lin, Tien-Chien
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Chi, Kai-Lun
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Liu, Li-Chun
We implement a deep neural network (DNN) to attain a 64-Gbps 4-PAM, 4-km MMF link by using 850-nm VCSEL, with BER of 4.41 x 10(-5). The data-rate-distance product achieves recorded high of 256-Gbps.km for Inter-data center applications.
High Bit-Rate Distance Product of 128 Gbps.km 4-PAM Transmission over 2-km 0M4 fiber Using an 850-nm VCSEL and a Volterra Nonlinear Equalizer
(2017-01-01)
Liu, Jun-Jie
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Chi, Kai-Lun
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Wei, Chia-Chien
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Lin, Tien-Chien
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Chuang, Chun-Yen
We successfully demonstrate a 64-Gbps 4-PAM transmission over 2-kin OM4 fiber incorporating a Volterra equalizer with BER of 6.5 x10(-5). Record high bit-rate distance product of 128 Gbps.km is confirmed for optical-interconnect applications.
Reducing the Impact of Nonlinear Distortion in DML-Based OFDM Transmission by Frequency Gap
(2018-12-01)
Hong-Minh Nguyen
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Wei, Chia-Chien
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Chuang, Chun-Yen
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Chen, Jyehong
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Taga, Hidenori
This paper demonstrates a novel approach to reducing in-band nonlinear distortion in DML-based OFDM transmission by introducing a frequency gap between the optical carrier and signal band. This scheme greatly increases tolerance to nonlinear distortion caused by the interaction between laser chirp and chromatic dispersion. Tuning the frequency gap between 2 to 5 GHz (in accordance with the transmission distance) makes it possible to mitigate a considerable proportion of dispersion-induced nonlinear distortion. Experiment results revealed that the proposed scheme can increase the achievable data rate by up to 136%, compared to conventional OFDM over 300 km of dispersion-uncompensated standard single mode fiber. Following transmission over more than 200 km, the proposed modulation scheme also outperforms conventional OFDM incorporating with a Volterra equalizer by up to 24%. We also conducted optimization of DML bias current and driving voltage. Our results show that operating at high bias and driving voltage can greatly improve data rates following the mitigation of distortion via gapped OFDM.
Sparse Volterra Nonlinear Equalizer by Employing Pruning Algorithm for High-Speed PAM-4 850-nm VCSEL Optical Interconnect
(2019-01-01)
Chuang, Chun-Yen
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Chang, Wei-Fan
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Wei, Chia-Chien
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Ho, Ching-Ju
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Huang, Cheng-Yu
A pruned Volterra equalizer that reduces computational complexity by up to 85.2% in 112-Gbps PAM-4 optical interconnects is proposed. The BER performance is competitive with LASSO-based Volterra equalizers, and training time is twice as fast.